F3K Timer Pro (net.f3j.android.timer.f3k) on Google Play
The stop watch program for F3K (HLG or DLG) model contests!automatic calulation of the left flight time in accordance with the actual task.Your can invalidate current/last flight or mark it as outlanding.Adjustable working time.Your can enter a new poker time during the flight.Airplane and wake lock mode (need user permissions and for Android < 4.2).